Logo GTP Schäfer

Risers and Application Technology

Regardless whether constructed from exothermic or insulating materials, risers and sleeves are selected purposefully by foundries seeking an increase in productivity and an overall improvement of the casting quality.

Exothermic or insulating risers are open or closed cavities within a casting mould, which are filled simultaneously, along with the casting, with liquid metal. In order to prevent the final piece from shrinking, risers should be designed in such a way that the solidification module is larger than that of the junction to the cast piece. Due to the larger solidification module, the riser keeps the metal contained inside longer in a liquid state, thus providing time to balance the volume deficit in the solidification phase of the piece. In this way, the final point of solidification occurs within the riser and the sealing of the cast piece is ensured.


In the past years, riser technology has clearly developed itself further owing to innovative product solutions. GTP Schäfer have maintained the production of traditional feeder systems and have furthered the advancement of their innovative product portfolio as well. Products such as their THERMO risers and exothermic/insulating sleeves, with and without breaker cores, have contributed to a clear increase in the efficiency and process optimisation of the foundry industry. The modular principle of the point riser portfolio was also supplemented by the development of metallic breaker cores (PX-ME series), which enables an efficient removal of the riser rest in the cleaning phase and makes it possible for the caster to increase the process security.

Through a high measure of innovation and flexibility, GTP Schäfer is continually seeking to advance the cost optimisation of foundries in order to effectively strengthen their competitive ability.